CN202444753U

CN202444753U - Shifting mechanism for transmission box assembly of power tiller

Info

Publication number: CN202444753U
Application number: CN201220073450XU
Authority: CN
Inventors: 廖佳袁
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-03-01
Filing date: 2012-03-01
Publication date: 2012-09-26
Anticipated expiration: 2022-03-01

Abstract

The utility model discloses a shifting mechanism for a transmission box assembly of a power tiller. The shifting mechanism comprises a main shaft and an auxiliary shaft, wherein three shift gears and a reverse-gear driving gear are arranged on the main shaft, three driven gears capable of meshing are arranged on the auxiliary shaft, and the auxiliary shaft is driven to rotate through meshing between the shift gears and the driven gears. A shifting device is provided with a shifting arm, a shifting sleeve, a shifting poking block and a shift positioning block, wherein the shifting arm, the shifting sleeve and the shifting poking block are integrated, and the shifting poking block is arranged between a first-gear driven gear and a second-gear driven gear. Steel balls and a spring are arranged in the shifting sleeve, a plurality of shift clamping grooves are arranged on the arc shift positioning block, and the steel balls are matched with the shift clamping grooves and fall into the shift clamping grooves. The shifting mechanism for the transmission box assembly of the power tiller is stable in power transmission in shifting, and improves stability and reliability in shifting. The shifting poking block rotates around the shifting arm, pushes the corresponding gears to be meshed so as to transmit power stably, and the shifting mechanism is simple and reliable in integral structure and effectively reduces failure rate.

Description

Mini-size tillage machine transmission case assembly gearshift

Technical field

The utility model relates to gearshift structure, the especially gearshift of transmission case assembly of mini-size tillage machine transmission case assembly and the drive mechanism that reverses gear.

Background technology

The available dynamic device; Like gasoline, diesel engine, gasoline, diesel oil are converted into kinetic energy through the burning in the combustion chamber with bioenergy (heat energy); Driven plunger moves up and down; Thereby drive the crankshaft rotating motion through connecting rod, the kinetic energy (moment of torsion) that produces is transmitted out through output shaft, drive the transmission case assembly and rotate.Because the rotating speed of crankshaft rotating is very high; Usually need to use after the speed change; So generally all the transmission gear shift casing will be set in power set back, the engagement of the shift gear through different gear ratio is when reducing its rotating speed; Realize the pace and the reverse rotation (reversing gear) of different rotating speeds (gear), drive the needs that whole transmission case assembly advances and reverses gear with high, medium and low gear output to satisfy power set.In the transmission gear shift casing, selector fork normally is set is connected with external shift handle, when the operator rotated shift handle, the corresponding rotation of selector fork promoted the corresponding shift gear and moves axially to mesh with corresponding power shift gear, realizes gearshift.But the selector fork of prior art, its structure are all more loaded down with trivial details usually, cause fault rate higher, keep in repair also cumbersome; And having reduced reliability and the stationarity when shifting gears, the impact during gearshift is relatively large.

Summary of the invention

The above-mentioned deficiency that the utility model technology exists to syndeton between existing mini-size tillage machine transmission case assembly power input and the output, transmission of power mini-size tillage machine transmission case assembly steady, simple in structure, that the reduce fault rate structure of shifting gears when a kind of the gearshift is provided.

The technical scheme of the utility model: mini-size tillage machine transmission case assembly gearshift structure; Comprise main shaft and countershaft; It is characterized in that: one retaining driving gear, two retaining driving gears, the three retaining driving gear and the driving gears that reverse gear are set at main shaft; On countershaft, be provided with one and keep off driven gear, two retaining driven gears and three retaining driven gears, a retaining driven gear can mesh with a retaining driving gear, drives countershaft and rotates; Two retaining driven gears can mesh with two retaining driving gears, drive countershaft and rotate; Three retaining driven tooth byes are enclosed within on the countershaft, are in normal engagement with three retaining driving gears, three retaining driven gears and two retaining driven gears through end face recessed/double wedge is meshed, makes three retaining driven gears drive two retaining driven gears and rotate, thereby drive the countershaft rotation;

Also be provided with reverse gear shaft and gearshift; Gearshift has gear arm, gearshift sleeve, gearshift shifting block and gear locating piece; Gear arm, gearshift sleeve, gearshift shifting block link into an integrated entity; The gearshift shifting block is arranged between a retaining driven gear and the two retaining driven gears, stirs a retaining driven gear and two when mobile respectively and keeps off driven gears and on countershaft, move axially; Be provided with steel ball and spring in the gearshift sleeve, spring is given the steel ball and spring active force; On the gear locating piece of arc, be provided with several gear draw-in grooves, steel ball cooperates with the gear draw-in groove and falls in the gear draw-in groove;

On reverse gear shaft; First of free cover driven gear and second driven gear that reverses gear that reverses gear being set; First driving gear that reverses gear that reverse gear on driven gear and the main shaft is in normal engagement, and second driven gear and first that reverses gear reverses gear that driven gear is connected and rotates synchronously; One retaining driven gear can with second the reverse gear driven gear engagement, second driven gear that reverses gear drives countershaft through a retaining driven gear and rotates.

Further characteristic is: spring is provided with two screws: location adjustment screw and lock-screw, location adjustment screw and lock-screw cooperate with the gearshift bush whorl.

The gear draw-in groove is five, evenly arrange on arc along the gear locating piece, respectively representative advance a retaining, two retainings that advance, ahead three retaining, reverse gear and neutral.

Second driven gear and first driven gear that reverses gear that reverses gear is made into duplicate gear.

The utility model mini-size tillage machine transmission case assembly gearshift structure with respect to prior art, has following characteristics:

Transmission of power is steady when 1, keeping off, reliability and stationarity when having strengthened gearshift; The gearshift shifting block rotates around gear arm, promotes corresponding gear and is meshed smooth transfer power.

2, overall structure is simple, reliable, effectively reduces fault rate.

Description of drawings

Fig. 1 is the utility model gearshift structural representation;

Fig. 2 is that the gearshift structure is in the status architecture sketch map that reverses gear;

Fig. 3 is gearshift (part a 20) structure cutaway view.

Embodiment

Like Fig. 1,2, shown in 3, the utility model mini-size tillage machine transmission case assembly gearshift structure comprises the main shaft 1 and countershaft 2 of transmission case assembly; Main shaft 1 is arranged in the transfer gear box with countershaft 2; Main shaft 1 is connected with the bent axle of power set, as power input shaft power is imported in the transfer gear box, and countershaft 2 is as output shaft; To pass through the power output transfer gear box of speed change, drive the drive disk assembly rotation of back etc.Above as prior art, do not do to further describe at this.

The improvement of the utility model; Be several shift gears to be set at main shaft 1; I.e. a retaining driving gear 3, two retaining driving gears 4, the three retaining driving gear 5 and the driving gears 6 that reverse gear, on countershaft 2, be provided with a retaining driven gear 7, two retaining driven gears 8 and three retaining driven gears, 9, one retaining driven gears 7 can with a retaining driving gear 3 engagements; Drive countershaft 2 and rotate, form a retaining rotating speed of power output; Two retaining driven gears 8 can mesh with two retaining driving gears 4, drive countershaft 2 and rotate, and form two of power output and keep off rotating speeds; Three retaining driven gears 9 skies are enclosed within on the countershaft 2, are in normal engagement with three retaining driving gears 5, and three retaining driving gears 5 drive three retaining driven gears 9 always and rotate when rotating, and rotate but three retaining driven gears 9 can not directly drive countershaft 2 when rotating; Three retaining driven gears 9 and two retaining driven gears 8 through end face recessed/double wedge is meshed (as keeping off the projection that protrusion is set on the end face of driven gears 9 three; Move into place the back correspondence at two retaining driven gears 8 and stretch in the groove of its end face and connect, drive two retaining driven gears 8 and rotate), behind two retaining driven gears, 8 shift positions; Can be meshed by/double wedge recessed through end face; Make three retaining driven gears 9 drive two retaining driven gears 8 and rotate, rotate, form three retaining rotating speeds of power output thereby drive countershaft 2;

Also be provided with reverse gear shaft 10 and gearshift 20; Gearshift 20 has gear arm 22, gearshift sleeve 23, gearshift shifting block 24 and gear locating piece 25; Gear arm 22, gearshift sleeve 23, gearshift shifting block 24 link into an integrated entity, and gear arm 22 is connected with external shift handle, when the operator rotates shift handle; Gear arm 22 rotates, and drives

gearshift sleeve

23,24 rotations of gearshift shifting block; Gearshift shifting block 24 is arranged between a retaining driven gear 7 and the two retaining driven gears 8, stirs one when rotating (moving) respectively and keeps off driven gear 7 and two and keep off driven gears 8 and on countershaft 2, move axially; Be provided with steel ball 26 and spring 27 in the gearshift sleeve 23, spring 27 is given steel ball 26 acting force of the spring; Spring 27 is provided with location adjustment screw and lock-screw 28 among the figure, and location adjustment screw and lock-screw 28 and gearshift sleeve 23 threaded engagement can be located the also elasticity of regulating spring 27, with the size of adjustment acting force of the spring.On the gear locating piece 25 of arc, be provided with several gear draw-in grooves 29, steel ball 26 cooperates with gear draw-in groove 29 and falls in the gear draw-in groove 29.Gear draw-in groove 29 among the figure is five; Evenly arrange along gear locating piece 25, respectively correspondence advance a retaining, two retainings that advance, ahead three retaining, reverse gear and neutral gear draw-in groove 29 expression neutrals (center position) in A position among the figure; B position gear draw-in groove 29 expressions an advancing retaining; C position gear draw-in groove 29 expressions advancing two retainings, D position gear draw-in groove 29 expression ahead three retainings, gear draw-in groove 29 expressions in E position are reversed gear.

On reverse gear shaft 10; First of free cover driven gear 11 and second driven gear 12 that reverses gear that reverses gear being set; First the reverse gear driven gear 11 is in normal engagement with the driving gear 6 that reverses gear on the main shaft 1; The driving gear 6 of always being reversed gear drives and rotates, and second reverses gear, and driven gear 12 and first reverses gear that driven gear 11 is connected and synchronous rotation perhaps is made into duplicate gear; One retaining driven gear 7 when moving to another station, can with second driven gear 12 engagement of reversing gear, second driven gear 12 that reverses gear drives countershafts 2 through a retaining driven gear 7 and rotates; The reverse gear driven gear 12, a retaining driven gear 7 of driven gear 11, second that reverse gear is delivered to countershaft 2 because power is the driving gear 6 that reverses gear, first on main shaft 1, and the rotation direction of countershaft 2 is opposite, has realized reversing gear.

The operation principle of the utility model: when starting power set, the steel ball 26 of gearshift sleeve 23 should be positioned at A position gear draw-in groove 29, i.e. neutral gear position; When the operator rotated external shift handle, gear arm 22 rotated, and drove

gearshift sleeve

23,24 rotations of gearshift shifting block, and the steel ball 26 in gearshift sleeve 23 is followed rotation; When steel ball 26 was positioned at the B position, a retaining driven gear 7 can mesh with a retaining driving gear 3, drives countershaft 2 and rotates, and is the retaining that advances; When steel ball 26 was positioned at the C position, two retaining driven

gears

8 and 4 engagements of two retaining driving gears drove countershaft 2 and rotate, and are two retainings that advance; When steel ball 26 was positioned at the D position, two retaining driven gears 8 cooperated through end face with three retaining driven gears 9, make three retaining driven gears 9 drive two retaining driven gears 8 and rotate, thereby 2 rotations of drive countershaft were ahead three and kept off; When steel ball 26 is positioned at the E position; Reverse gear driven gear 12 of one retaining driven gear 7 and second meshes; The driving gear 6 that reverses gear, first on main shaft 1 the reverse gear driven gear 12, a retaining driven gear 7 of driven gear 11, second that reverse gear is delivered to countershaft 2, and countershaft 2 backward rotation are and reverse gear.

Claims

1. mini-size tillage machine transmission case assembly gearshift structure; Comprise main shaft (1) and countershaft (2); It is characterized in that: a retaining driving gear (3), two retaining driving gears (4), three retaining driving gear (5) and the driving gears that reverse gear (6) are set at main shaft (1); On countershaft (2), be provided with one and keep off driven gear (7), two retaining driven gears (8) and three retaining driven gears (9), a retaining driven gear (7) can mesh with a retaining driving gear (3), drives countershaft (2) and rotates; Two retaining driven gears (8) can mesh with two retaining driving gears (4), drive countershaft (2) and rotate; Three retaining driven gear (9) skies are enclosed within on the countershaft (2); Be in normal engagement with three retaining driving gears (5); Three retaining driven gears (9) and two keep off driven gears (8) through end face recessed/double wedge is meshed; Make three retaining driven gears (9) drive two retaining driven gears (8) and rotate, rotate thereby drive countershaft (2);

Also be provided with reverse gear shaft (10) and gearshift (20); Gearshift (20) has gear arm (22), gearshift sleeve (23), gearshift shifting block (24) and gear locating piece (25); Gear arm (22), gearshift sleeve (23), gearshift shifting block (24) link into an integrated entity; Gearshift shifting block (24) is arranged between a retaining driven gear (7) and the two retaining driven gears (8), stirs a retaining driven gear (7) when mobile respectively and moves axially on countershaft (2) with two retaining driven gears (8); Be provided with steel ball (26) and spring (27) in the gearshift sleeve (23), spring (27) is given steel ball (26) acting force of the spring; On the gear locating piece (25) of arc, be provided with several gear draw-in grooves (29), steel ball (26) cooperates with gear draw-in groove (29) and falls in the gear draw-in groove (29);

On reverse gear shaft (10); First of free cover driven gear (11) and second driven gear (12) that reverses gear that reverses gear being set; First driving gear that reverses gear (6) that reverse gear on driven gear (11) and the main shaft (1) is in normal engagement, and second reverses gear, and driven gear (12) and first reverses gear that driven gear (11) is connected and synchronous rotation; One retaining driven gear (7) can with second reverse gear driven gear (12) engagement, second driven gear (12) that reverses gear drives countershaft (2) through a retaining driven gear (7) and rotates.

2. according to the said mini-size tillage machine transmission case of claim 1 assembly gearshift structure, it is characterized in that: spring (27) is provided with lock-screw (28), lock-screw (28) and gearshift sleeve (23) threaded engagement.

3. according to claim 1 or 2 said mini-size tillage machine transmission case assembly gearshift structures; It is characterized in that: said gear draw-in groove (29) is five; Evenly arrange on arc along gear locating piece (25), respectively correspondence advance a retaining, two retainings that advance, ahead three retaining, reverse gear and neutral.

4. according to the said mini-size tillage machine transmission case of claim 3 assembly gearshift structure, it is characterized in that: second driven gear (12) and first driven gear (11) that reverses gear that reverses gear is made into duplicate gear.